SEHunter, if your loaded round case mouths measure .256" at their smallest, get a bushing with an inside diameter of .255" or .254". You typically need bushings about 1 to 3 thousandths smaller than a loaded round diameter. For 22 caliber cases, only 1 or 2 thousandths smaller is good enough as they don't have enough recoil to make harder neck grip on bullets a requirement.
It depends on the neck wall thickness as well as how hard or soft the brass is in case necks. Some folks get 2 or 3 bushings covering a range they'll want to experiment with.
Yes, get either the RCBS or Redding full bushing die. Sierra Bullets uses the Redding version, but both are top notch stuff.
Last edited by Bart B.; November 10, 2012 at 08:11 PM.